Claude Sonnet 4.5 vs GPT OSS 120B
Compare Claude Sonnet 4.5 by Anthropic against GPT OSS 120B by OpenAI, in 25 community votes, claude sonnet 4.5 wins 70% of head-to-head duels, context windows of 200K vs 131K, tested across 43 shared challenges. Updated June 2026.
Which is better, Claude Sonnet 4.5 or GPT OSS 120B?
Claude Sonnet 4.5 is the better choice overall, winning 70% of 25 blind community votes on Rival. Claude Sonnet 4.5 costs $3/M input tokens vs $0.18/M for GPT OSS 120B. Context windows: 200K vs 131K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Sonnet 4.5 and GPT OSS 120B
Claude Sonnet 4.5 is made by anthropic while GPT OSS 120B is from openai. Claude Sonnet 4.5 has a 200K token context window compared to GPT OSS 120B's 131K. On pricing, Claude Sonnet 4.5 costs $3/M input tokens vs $0.18/M for GPT OSS 120B. In community voting, In 25 community votes, Claude Sonnet 4.5 wins 70% of head-to-head duels.
In 25 community votes, Claude Sonnet 4.5 wins 70% of head-to-head duels. Claude Sonnet 4.5 leads in Reasoning, Image Generation. Based on blind community voting from the Rival open dataset of 25+ human preference judgments for this pair.
Per 1M tokens
GPT OSS 120B is cheaper on both — 17× input, 19× output
Pick Claude Sonnet 4.5. In 25 blind votes, Claude Sonnet 4.5 wins 70% of the time. That's not luck.
Claude Sonnet 4.5 particularly excels in Image Generation, Reasoning. GPT OSS 120B is 19x cheaper per token — worth considering if cost matters.
Style Comparison
Claude Sonnet 4.5 uses 4.9x more sentence length
